Argentine/Argentinean Spanish
I have been learning Spanish for 3 years now and am conversational. My friend who is Argentine taught me that they have a large Italian and Spanish influence. They use words like "Chao" and instead of pronouncing LL like the English Y, they say SHH. In addition, they say the word CHE at the end of sentences as a filler.
Argentine/Argentinean Spanish-Though I spoke Spanish fluently, I could not understand a word of the Argentine, for he had an impenetrable accent and used much slang.